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This should print in the output file the processes that are
ON on any level:

#!/usr/bin/perl

use strict;
use warnings;

open my $chkconfig, '-|', '/sbin/chkconfig', '--list' or die...

I'd tend to use grep on an array rather than a string, for a string I'd go for something like the following with a straight regex. (Note: regex used works for my flavour of netstat and may need...

Reading from a filehandle, such as STDIN, will always read all characters up to and including the new line character(s), and save them to the variable given on the left side. That means when your...

use strict; and use warnings; will catch & tell you about a lot of potential errors if you let them
Without chomp $port will still have a newline at the end of the string, which will be included in...